---
kind: "section"
citation: "40 C.F.R. § 147.1655"
title: "40"
number: "147.1655"
heading: "Requirements for wells authorized by permit."
url: "https://uscodex.org/cfr/40/147.1655"
---

# §147.1655. Requirements for wells authorized by permit.

- (a) The owner or operator of a Class I well authorized by permit shall install or shall ensure that the well has:
  - (1) Surface casing present;
    - (i) Extending from the surface to a depth at least 50 feet below the base of the lowermost USDW; and
    - (ii) Cemented back to the surface by recirculating the cement; and
  - (2) Long string casing and tubing;
    - (i) Extending to the injection zone; and
    - (ii) **Cemented back to 50 feet above the base of the next largest casing string.**
- (b) **The owner or operator of a new Class II well authorized by permit shall—**
  - (1) **Install surface casing from the surface to at least 50 feet below the base of the lowermost USDW.**
  - (2) Cement the casing by recirculating to the surface or by using no less than 120% of the calculated annular volume.
  - (3) **For new enhanced recovery wells, install tubing or long string casing extending to the injection zone.**
  - (4) For new salt water disposal wells, install long string casing and tubing extending to the injection zone.
  - (5) Isolate any injection zone by placing sufficient cement to fill the calculated volume to a point 50 feet above the injection zone.
- (c) The Regional Administrator may specify casing and cementing requirements other than those listed in paragraphs [(a)](#a) and [(b)](#b) of this section on a case by case basis as conditions of the permit.

## Notes

### Authority

Authority: 42 U.S.C. 300f et seq.; and 42 U.S.C. 6901 et seq.

### Source

Source: 49 FR 20197, May 11, 1984, unless otherwise noted.